Invite users to existing rooms (#441)

Invite users to existing rooms

Scope:

- Allow inviting from the room detail screen and the member list
- Invite option is only shown if the user has the correct power level
- Search flow the same as creating a new room, allowing multi-select
- Existing room members/invitees are disabled with a custom caption
- Sending is asynchronous, an error dialog will appear wherever the
  user is if necessary

Closes #245

features/roomdetails/impl/build.gradle.kts

@@ -43,6 +43,7 @@ dependencies {
     implementation(projects.libraries.androidutils)
     api(projects.features.roomdetails.api)
     api(projects.libraries.usersearch.api)
+    api(projects.services.apperror.api)
     implementation(libs.coil.compose)
 
     testImplementation(libs.test.junit)
@@ -51,6 +52,7 @@ dependencies {
     testImplementation(libs.test.truth)
     testImplementation(libs.test.turbine)
     testImplementation(projects.libraries.matrix.test)
+    testImplementation(projects.libraries.usersearch.test)
     testImplementation(projects.tests.testutils)
 
     ksp(libs.showkase.processor)